Aftermarket Motors) PSC Motors

1. PSC Motors Overview:

   • Stands for Permanent Split Capacitor.
   • Split phase AC induction motor, also called an induction motor.
   • Uses a single run capacitor with winding for startup and operation.

2. Components:

   • Run Winding: Connected directly to AC power.
   • Start Winding: Connected to power via the capacitor, causing a phase shift and creating a magnetic field to start the motor.

3. Operation:

   • Voltage reaches run winding first, then travels through the capacitor to start winding.
   • Both windings stay connected to the circuit throughout the cycle, maintaining operation.

4. Efficiency and Performance:

   • Designed for fixed horsepower.
   • Low efficiency, around 60%, due to energy loss as heat.
   • Speed and torque are fixed; efficiency drops with increased static pressure.
   • May run at constant full speed if static pressure is low.

5. Applications:

   • Used in condenser fan motors, blower motors, and inducer motors.

6. Power Matching:

   • Important to match the motor power to system needs for maximum efficiency.
   • Ratings include amperage and horsepower.
   • Horsepower used for calculating air flow; must be considered along with amperage.
   • Replacing motors: Match amperage, up to 25% more is acceptable.

7. Advantages of PSC Motors:

   • Popular retrofit option due to simplicity and lack of programmability.
   • Universal compatibility with various equipment setups.